JP2002056558A - Magneto-optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magneto-optical disk recording and reproducing device which is capable of recording signals to a disk by a laser emitted from an optical head. SOLUTION: This device is provided with a temperature detecting element 12 for a motor which is disposed to detect the temperature of the spindle motor 2 for rotationally driving the disk 1, a temperature detecting element 13 for the optical head which is disposed to detect the temperature of the optical head 4 and a temperature detecting element 14 for the device which is disposed in order to detect the temperature within the magneto-optical disk recording and reproducing device. The rotating speed of the spindle motor 2 and the laser output of the optical head 4 are controlled in accordance with the temperatures obtained by the respective temperature detecting elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk recording / reproducing apparatus which performs a signal recording operation and a signal reproducing operation using a laser radiated from an optical head onto a disk rotated and driven by a spindle motor. Related to the device.

[0002]

2. Description of the Related Art When the temperature is locally increased by irradiating radiant energy such as a laser beam onto a magneto-optical disk, the coercive force of the magnetic field is reduced, and the magnetic domains are formed in accordance with the direction of the magnetic field acting on this area. 2. Description of the Related Art A magneto-optical disk recording / reproducing apparatus configured to perform a signal recording / reproducing operation by utilizing the arrangement has been commercialized.

[0003]

The magneto-optical disk recording / reproducing apparatus is often used in combination with a computer. In this case, a large amount of data signals are recorded and the signal reading speed is increased. ing. In the magneto-optical disk recording / reproducing apparatus, in order to perform a high-speed recording / reproducing operation, it is necessary to increase the rotation speed of the disk or increase the output of the laser emitted from the laser element incorporated in the optical head.

[0004] When the rotation speed of the spindle motor is increased to increase the rotation speed of the disk, the temperature rises, and when the output of the laser is increased, the temperature of the optical head rises. Temperature rises, and there is a problem that the operation of reading signals from the disk and the operation of recording signals on the disk cannot be performed normally.

An object of the present invention is to provide a magneto-optical disk recording / reproducing apparatus which solves such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention provides a motor temperature detecting element provided for detecting a temperature of a spindle motor for rotating a disk, and a light provided for detecting a temperature of an optical head. A head temperature detecting element and a device temperature detecting element provided to detect the temperature in the magneto-optical disk recording / reproducing apparatus are provided, and based on the temperatures obtained from the temperature detecting elements, the rotational speed of the spindle motor and The laser output of the optical head is controlled.

[0007]

FIG. 1 is a diagram showing an embodiment of a magneto-optical disk recording / reproducing apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a magneto-optical disk, which is mounted on a turntable 3 driven to rotate by a spindle motor 2, and is configured to be driven to rotate by the turntable 3.
Reference numeral 4 denotes an optical head disposed below the magneto-optical disk 1, which focuses a laser beam emitted from a laser element (not shown) on a signal recording surface provided on the magneto-optical disk 1. Thus, the operation of performing the signal reproducing operation and the signal recording operation is performed.

Reference numeral 5 denotes a magnetic head disposed above the magneto-optical disk 1 and at a position facing the optical head 4, and moves in the radial direction of the magneto-optical disk 1 integrally with the optical head 4. Mounted on a supporting substrate (not shown).

Reference numeral 6 denotes an RF signal amplifying circuit for amplifying an RF signal obtained from a photodetector incorporated in the optical head 4 and shaping the waveform.
And a focusing control operation for focusing a light beam emitted from the optical head 4 on a signal surface provided on the magneto-optical disk 1 based on a signal obtained through the optical head 4 and applying the light beam to a signal track on the signal surface. This is an optical head control circuit that performs a tracking control operation for following up, and incorporates a focus servo circuit and a tracking servo circuit.

Reference numeral 8 denotes a digital signal processing circuit that performs digital signal processing of signals output from the RF signal amplifier circuit 6 and performs demodulation operations of various signals, and 9 denotes an input of a signal demodulated by the digital signal processing circuit 8. And a system control circuit for controlling the operation of the magneto-optical disk recording and reproducing apparatus. Reference numeral 10 denotes a spindle motor drive circuit whose operation is controlled by the system control circuit 9, which is configured to control the rotation operation of the spindle motor 2. 11 is the system control circuit 9
The magnetic head drive circuit controls the operation of the magnetic head 5 and applies a recording signal during a recording operation to a coil incorporated in the magnetic head 5.

Reference numeral 12 denotes a motor temperature detecting element provided inside or near the spindle motor 2 for detecting the temperature of the spindle motor 2, and its output signal is input to the system control circuit 9. It is connected to the. Reference numeral 13 denotes an optical head temperature detecting element provided inside or near the optical head 4 for detecting the temperature of the optical head 4, and its output signal is connected so as to be input to the system control circuit 9. Have been. 14
Is a device temperature detecting element provided inside the magneto-optical disk recording / reproducing apparatus for detecting the temperature in the magneto-optical disk recording / reproducing apparatus, particularly in a place which is easily affected by the temperature. It is connected so as to be input to the control circuit 9.

In such a configuration, the reading speed of the signal recorded on the magneto-optical disk 1 can be increased by increasing the rotation speed of the magneto-optical disk 1. The operation of recording signals to the magneto-optical disk 1 is also performed at a high speed by increasing the rotation speed of the magneto-optical disk 1. A signal processing operation of the digital signal processing circuit 8 or the like for performing such a high-speed recording / reproducing operation, a rotation speed control operation of the spindle motor 2, a laser output adjustment control operation of the optical head 4, and a drive control operation of the magnetic head 5 Are performed by the system control circuit 9 corresponding to each speed.

Although the magneto-optical disk recording / reproducing apparatus according to the present invention is constituted as described above, the operation will now be described. When a command signal for performing a reproducing operation is input to the system control circuit 9, the system control circuit 9
Is started, and the operation of reproducing the signal recorded on the magneto-optical disk 1 is started.

In the reproducing operation, only the optical head 4 operates, and the magnetic head 5 does not operate. A focusing control operation for focusing a light beam emitted from the optical head 4 on a signal surface and a tracking control operation for following a signal track are performed by an optical head control circuit 7, and reading of a signal recorded on the magneto-optical disk 1 is performed. The operation is performed. The signal read from the optical head 4 is input to an RF signal amplifier circuit 6 where it is amplified and shaped, and then input to a digital signal processing circuit 8. The signal input to the digital signal processing circuit 8 is subjected to various digital signal processing and demodulation of various signals. The signal processed in this manner is output to an externally provided computer device or the like through an output circuit (not shown). Although the reproducing operation is performed in this manner, the displacement operation of the optical head 4 in the radial direction of the magneto-optical disk 1 is performed by the rotation of the pickup feed motor (not shown). The operation of controlling the rotation of the pickup feed motor is performed by detecting the deviation of the objective lens incorporated in the optical head 4, but such operation is well known and will not be described. When the pickup feed motor rotates, the support substrate is moved in the radial direction of the magneto-optical disk 1, so that the optical head 4 and the magnetic head 5 can be moved in conjunction with each other. The moving operation of the head 5 is also performed during the recording operation.

As described above, the reproducing operation in this embodiment is performed. Next, the recording operation will be described.
When a command signal for performing a recording operation is input to the system control circuit 9, a control operation for performing the recording operation by the system control circuit 9 is started. Such a recording operation is
This is performed by applying a recording signal to the magnetic head 5 while performing an operation of focusing and following a light beam emitted from the optical head 2 to the signal track. A recording signal is input to a magnetic head driving circuit 11 through a recording signal input circuit (not shown), and a signal output from the magnetic head driving circuit 11 is applied to the magnetic head 5 so that a recording signal such as a data signal is generated. Can be recorded on the magneto-optical disk 1.

As described above, the reproducing operation and the recording operation in this embodiment are performed. Next, the gist of the present invention will be described. In the magneto-optical disk recording / reproducing apparatus, when the above-described operation is performed, the temperature detection operation by each of the temperature detection elements 12 for the motor, the temperature detection element 13 for the optical head, and the temperature detection element 14 for the apparatus. Is performed constantly, and the detection signal is input to the system control circuit 9.

When the signal recorded on the magneto-optical disk 1 is read at a high speed, the spindle motor 2 is driven to rotate at a high speed, so that the heat generated by the spindle motor 2 increases. As a result, the temperature of the spindle motor 2 increases, and when the temperature increases, the temperature of the center of the magneto-optical disk 1 increases. When the temperature at the center of the magneto-optical disk 1 rises, the magneto-optical disk 1 is warped,
The signal reading operation cannot be performed.

When the temperature of the magneto-optical disk 1 reaches a temperature at which there is a risk of warping, the control operation of the system control circuit 9 is performed, and the rotational speed of the spindle motor 2 is reduced to bring the signal read operation to a state. . When the rotation speed of the spindle motor 2 is reduced, the heat generated by the spindle motor 2 decreases, and as a result, the temperature of the spindle motor 2 decreases. In this manner, when the temperature of the spindle motor 2 decreases, the temperature of the central portion of the magneto-optical disk 1 decreases, so that the magneto-optical disk 1 does not warp and the signal reading operation continues without any trouble. I can do it. The control operation for the temperature rise of the spindle motor 2 which occurs when the reading operation of the signal recorded on the magneto-optical disk 1 is performed at a high speed is performed as described above. The description is omitted.

The control operation for the temperature rise of the spindle motor 2 is performed as described above.
The operation in the case where the temperature rises will be described. The reason why the temperature of the optical head 4 rises is that the output of the laser is increased to perform a high-speed recording operation. In order to perform a signal recording operation by rotating the magneto-optical disk 1 at a high speed, it is necessary to sharply raise the temperature of the signal recording position of the magneto-optical disk 1 by a laser output from the optical head 4. It is necessary to increase the laser output.

When a large driving current is supplied to the laser element incorporated in the optical head 4, the temperature of the optical head 4 rises. When the temperature of the optical head 4 rises, the output of the laser becomes unstable, and the recording operation on the magneto-optical disk 1 cannot be performed accurately.

When the temperature at which the signal recording operation on the magneto-optical disk 1 may not be performed accurately is reached, the control operation of the system control circuit 9 is performed, and the drive current value supplied to the laser element is reduced. The state is lowered so that the signal recording operation is performed. When the drive current value supplied to the laser element is reduced, the heat generated from the laser element is reduced, and as a result, the temperature of the optical head 4 decreases. In this way, when the temperature of the optical head 4 decreases, the output of the laser stabilizes.
The operation of recording a signal to the device can be performed accurately. The control operation for the temperature rise of the optical head 4 that occurs when the operation of recording a signal on the magneto-optical disk 1 is performed at a high speed is performed as described above. Is omitted.

The control operation when the temperature of the spindle motor 2 rises and when the temperature of the optical head 4 rises is performed as described above. Next, when the temperature inside the magneto-optical disk recording / reproducing apparatus rises, The operation will be described.

When the temperature inside the magneto-optical disk recording / reproducing apparatus rises due to the high-speed rotation of the spindle motor 2 or the operation of increasing the laser output of the optical pickup 4, the above-described signal reproducing operation and signal recording operation can be performed accurately. No situation.

When the temperature at which there is a risk that the operation of reproducing the signal recorded on the magneto-optical disk 1 or the operation of recording the signal on the magneto-optical disk 1 may not be performed accurately, the control of the system control circuit 9 is performed. The operation is performed, and an operation of reducing the drive current value supplied to the laser element and an operation of reducing the rotation speed of the spindle motor 2 are performed. By performing such a control operation, the amount of heat generated by the laser element and the amount of heat generated by the spindle motor 2 are reduced, and as a result, the temperature in the magneto-optical disk recording / reproducing device decreases. Become. In this way, when the temperature in the magneto-optical disk recording / reproducing device falls, the output of the laser and the rotational drive characteristics of the magneto-optical disk 1 by the spindle motor 2 are stabilized. The reproducing operation and the signal recording operation on the magneto-optical disk 1 can be performed accurately.

[0025]

The present invention relates to a spindle motor for rotating and driving a disk in a magneto-optical disk recording / reproducing apparatus configured to record a signal on the disk by a laser radiated from a laser element incorporated in an optical head. A temperature detecting element for a motor provided to detect the temperature of the optical disk, a temperature detecting element for an optical head provided for detecting the temperature of the optical head, and a temperature detecting element in the magneto-optical disk recording / reproducing apparatus. The device temperature detecting elements provided are provided, and the rotation speed of the spindle motor and the laser output of the optical head are controlled based on the temperature obtained from each temperature detecting element. The reproducing operation and the recording operation can be performed accurately.

According to the present invention, a plurality of temperature detecting elements are provided, and the rotation speed of the spindle motor and the laser output of the optical head are controlled based on the temperature obtained from the temperature detecting elements. And a control operation combining the detection outputs obtained from the respective detection elements can be performed, thereby providing an advantage that a magneto-optical disk recording / reproducing apparatus having excellent recording / reproducing characteristics can be provided. .

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a magneto-optical disk recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magneto-optical disk 2 Spindle motor 4 Optical head 5 Magnetic head 7 Optical head control circuit 8 Digital signal processing circuit 9 System control circuit 10 Spindle motor drive circuit 12 Temperature detection element for motor 13 Temperature detection element for optical head 14 Temperature detection for device element

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 11/105 553 G11B 11/105 553H 19/02 501 19/02 501W 19/247 19/247 R (72 ) Inventor: Masataka Yamanaka, 2-5-5, Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F term (reference) 5D075 AA03 BB04 CC31 CD11 5D090 AA01 BB10 CC01 CC04 DD03 DD05 EE02 EE11 FF36 FF41 HH03 JJ07 KK03 5D109 KA17 KB40 5D119 AA11 AA23 BA01 BB05 EC09 HA30 HA44

Claims (4)

[Claims] In a magneto-optical disk recording / reproducing apparatus configured to record a signal on a disk by a laser radiated from a laser element incorporated in an optical head, a temperature of a spindle motor for rotating the disk is detected. A temperature detecting element for the motor provided to detect the temperature of the optical head, a temperature detecting element for the optical head provided for detecting the temperature of the optical head, and a temperature detecting element for detecting the temperature in the magneto-optical disk recording / reproducing apparatus. A magneto-optical disk recording / reproducing apparatus, comprising: a device temperature detecting element; and controlling a rotation speed of a spindle motor and a laser output of an optical head based on a temperature obtained from each temperature detecting element. 2. The magneto-optical disk recording / reproducing apparatus according to claim 1, wherein when the temperature of the spindle motor rises, the rotation speed of the spindle motor is decreased. 3. The magneto-optical disk recording and reproducing apparatus according to claim 1, wherein the laser output is reduced when the temperature of the optical head rises. 4. The magneto-optical disk according to claim 1, wherein when the temperature in the magneto-optical disk recording / reproducing device rises, the rotation speed of the spindle motor is reduced and the laser output is reduced. Recording and playback device.